Handle bar



Dec. 14, 1943. A. G zbA 2,456,267

HANDLE BAR Filed Oct. 1, 1945 Patented Dec. 14, 1948 UNITED STATES ATENT OFFICE HANDLE BAR Antoine Gazda, Providence, R. I.

Application October 1, 1945, Serial No. 619,624

5 Claims. 1

The present invention relates to a handle bar particularly adapted for use in situations wherein shocks and vibrations and the like may be transmitted to the person grasping the handle bar. Such situations exist, for instance, in connection with pneumatic paving breakers, hammers, drills, etc.

A primary object of the present invention is the embodiment of a handle bar construction useful in situations of the above enumerated type for reducing the magnitude of the shocks and vibrations transmitted to the arms and body of the handle bar operator. To this end, briefiy stated, the handle bar construction consists of a relationship of parts which is resilient in character, comprising one or more leaf springs of steel, wood or any other suitable material, allowing flexibility in one direction only, i. e. in a vertical direction parallel to the longitudinal axis of the pneumatic tool.

A further object of the invention is the realization of a handle bar construction of the above type and of simplified character, whereby the desired results may be accomplished with a minimum number of parts.

Illustrative modes of carrying out the present invention are shown by way of example on the accompanying sheet of drawings, on which:

Fig. 1 is a diagrammatic showing in elevation of a pneumatic breaker, hammer or drill equipped with a spring handle;

Fig. 2 is a detail view showing the relationship of parts of the handle construction of Fig. 1;

Fig. 3 is a fragmentary longitudinal section through the said relationship of parts;

Fig. 4 is a detail view showing the relationship of parts according to a second embodiment of the handle;

Fig. 5 is a detail view showing the relationship of parts according to a third embodiment of the handle;

Fig. 6 is a detail view showing the relationship of parts according to a fourth embodiment of the handle; and

Fig. 7 is a detail View showing the relationship of parts according to a fifth embodiment of the handle.

As shown in Fig. 1, the tool, which may be a pneumatic breaker, hammer, drill or the like, is shown generally at 10. the tool body in any suitable and desirable manner is the resilient handle bar H. The securing means are shown diagrammatically at H and may, for example, comprise upstanding loops or yokes through which the handle bar H extends,

Mounted on the top of together with nut and bolt means for securing purposes.

As shown in Figs. 2 and 3, the handle bar ll may conveniently be built up of superposed laminae or leaf springs, the central one I2 of which is preferably the main or thickest leaf spring. superposed on central leaf spring i2, on each side thereof is another leaf spring l3 of less thickness, and superposed on each of leaf springs I3 is a further leaf spring M. For use on tools, such as tool [0, it is preferred that the several described leaf springs be commensurate in their horizontal dimensions. Since relative movement may take place between the several leaf springs during flexing thereof, a longitudinal slot [5 may conveniently be provided in the several leaf springs l3 and I4, through which securing bolt 56 extends. A cylindrical bore is provided in the central or main leaf spring I2 for the reception of the said bolt. If desired, a layer or layers of a friction and force absorbin material, such as leather or the like, may be placed between the leaf springs in order further to damp vibrations transmitted therethrough.

In the embodiment according to Fig. 4, the resilient handle is composed of a single fiat spring I! covered by a spiral spring l8 of tubular configuration. The tubular springs 18 need only encompass the end portions of the spring ll, i. e., from the securing means ll outwardly. The fit between the flat spring H and the interior of the spiral tube i3 is a friction fit.

According to Fig. 5, the resilient handle is comprised of a fiat spring l9 covered on each side by resilient material 28 (rubber or the like) integrated in any known manner with the spring ii the parts being configured as shown in Fig. 5 to constitute a cylindrical structure. The material 20 has sufficient flow characteristics to yield when the handle flexes in operation.

Fig. 6 shows an embodiment according to Fig. 4 but with the additional feature that the spiral spring I8 is in turn covered by a thin resilient (rubber or the like) tube 20 tightly fitted thereon.

According to Fig. 7, the spiral spring 18 is omitted and the tube 20 is mounted directly on the fiat spring l8.

What is claimed is:

1. A resilient handle for pneumatic breakers, hammers, drills and the like, comprising a flat spring and a spiral spring in tubular shape substantially encompassing the same, the inner surface of said spiral spring being juxtaposed to said flat spring and extending to each free end thereof.

2. A resilient handle for pneumatic breakers,

hammers, drills and the like, comprising a fiat spring and a resilient tube substantially encompassing the same, the inner surface of said resilient tube being juxtaposed to said fiat spring and extending to each free end thereof.

3. A resilient handle for pneumatic breakers, hammers, drills and the like, comprising a flat spring, a layer of resilient material secured to each side thereof and extending to each free end thereof, the configuration of the several parts being such as, to jointly define a cylinder.

4. A resilient handle for pneumatic breakers, hammers, drills and the like, comprising a flat spring, resilient means arranged on two sides thereof and yieldably connected thereto, said resilient means and said spring beingcoextensive at the free ends thereof, the said handle being adapted for attaching to a pneumatic tool and being flexible only in a vertical direction parallel to the longitudinal axis of said tool.

5. A resilient handle for pneumatic breakers,

hammers, drills and the like, comprising a fiat spring, a spiral spring in tubular shape forming a closed coil substantially encompassing said flat spring and extending to each free end thereof, the inner surface of said spiral spring being juxtaposed to said flat spring and a resilient tube covering said spiral spring in tight engagement 5 therewith and substantially coextensive therewith.

ANTOINE GAZDA.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date is 578,020 Morse Mar. 2, 1897 1,165,142 Stanton Dec. 21, 1915 1,331,875 Roberts Feb. 24, 1920 1,719,007 Gazda July 2, 1929 1,828,626 Coates July 26, 1932 FOREIGN PATENTS Number Country Date 126,097 Austria Dec. 28, 1931 

